Compound topographic index (relative wetness) 0.95173 Precipitation during the wettest quarter 1.04083 Elevation 1.36456 Nitrogen content of soil 1.37757 Precipitation during the driest quarter 1.45597 Carbon content of soil 1.95313 Bulk density of soil 1.99477 Temperature during the hottest quarter 2.2568 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.26602 Available water holding capacity of soil 2.53434 Sum of monthly Tavg where Tavg >=5 deg C 2.55602 Day/night diurnal temperature difference 2.93545 Solar interception 3.49793 Precipitation during the coldest quarter 4.02682 Ratio of precipitation to potential evapotranspiration 4.9537 Temperature during the coldest quarter 6.38592 Precipitation during the hottest quarter 6.61816